Discuss the reasons and solutions for phpmysqli not being found

From Mr. Hudie's facial expression, you can see that he is suffering from phpmysqli. He had spent hours working on the problem but had yet to find a solution. He uses the phpmysqli extension in his project, but every time he uses the extension, he always gets an "extension not found" error message. In this post, we’ll dive into why phpmysqli can’t be found and how to fix it.

First, we need to understand how the phpmysqli extension works. The phpmysqli extension is a database extension in PHP used to access MySQL databases. It provides a set of functions similar to mysqli and supports both object-oriented and process-oriented development modes. The phpmysqli extension is loaded via the extension_dir parameter in the PHP configuration file. This parameter specifies the directory where the extension library file is located. When the PHP server starts, the extension library in this directory will be automatically loaded into memory for use by the program.

So, why did Mr. Hudie encounter the "Extension not found" error? This is usually caused by the extension_dir parameter not being configured correctly in the php.ini file. The php.ini file is the PHP configuration file, which contains various PHP-related configuration information. In this file, there is a parameter called extension_dir, which indicates the directory where the PHP extension library file is located. If this parameter is not configured correctly, PHP cannot find the library file and cannot load the extension.

So, how to solve this problem? The solution is simple, just set the extension_dir parameter in the php.ini file to the correct directory. Normally, the default value for this parameter is already configured correctly. However, in Mr. Hudie's case, it may be that he modified the php.ini file when using a different PHP version, causing this parameter to be modified.

In order to determine whether the extension_dir parameter is set correctly, you can use the phpinfo() function in the PHP program to view the PHP configuration information. This function will return all configuration information of PHP, including various parameters in the php.ini file. In this configuration information, you can find the value of the extension_dir parameter and confirm whether it matches the directory where the PHP extension library file is located.

In short, the problem that phpmysqli cannot find the extension is usually caused by the extension_dir parameter not being configured correctly. The solution is also very simple, just set the correct extension_dir parameter in the php.ini file. If you still encounter problems, you can try using the phpinfo() function in your PHP program to view PHP's configuration information to determine the source of the problem.

The above is the detailed content of Discuss the reasons and solutions for phpmysqli not being found. For more information, please follow other related articles on the PHP Chinese website!